Recent content by lm93

I found the number of moles of air but I am a bit confused as to what the pressure would be inside the balloon.

I tried using the buoyancy force formula to find the density of the hot air and got 0.134kg/m3 but that didn't help

I appreciate your help but I still don't know where I am going with this problem...

maybe try to think about it in terms of grams it definitely has a negative exponent i think this one is more of a common sense question...

Ok thanks a lot; I'll try that.

Homework Statement A hot-air balloon achieves its buoyant lift by heating the air inside the balloon, which makes it less dense than the air outside. Suppose the volume of a balloon is 1900 m3 and the required lift is 2500 N (rough estimate of the weight of the equipment and passenger)...

YESSSSSS I got it right! Thanks SO much!

yes, because the relative pressure is the pressure minus the atmospheric pressure and since it is at atmospheric pressure then it would be zero.

I got 5662.6N but I'm not sure if it's correct.

Oh...would it be zero?

Oh I did forget to use absolute temperature! Thank you very much! I will try it again taking that into account... So do I also have to use absolute pressure as well or is that not necessary? If not then I would get P2=P1(T2/T1) P2=101325N/m2(433K/293K)-->P2=149739.68N/m2

Homework Statement In an internal combustion engine, air at atmospheric pressure and a temperature of about 20°C is compressed in the cylinder by a piston to 1/4 of its original volume (compression ratio = 4.0). Estimate the temperature of the compressed air, assuming the pressure reaches 20...